Swift中的闭包例子

常见的实现，

要熟悉了解，

至于闭包逃逸，

自动闭包这些内容，

可以以后用到时再学吧。

let names = ["Chris", "Alex", "Eva", "Barry", "Daniella"] func backward(_ s1: String, _ s2: String) -> Bool { return s1 < s2 } var rNames = names.sorted(by: backward) rNames = names.sorted(by: {(s1: String, s2: String) -> Bool in return s1 > s2 }) rNames = names.sorted(by: {(s1: String, s2: String) -> Bool in return s1 > s2}) rNames = names.sorted(by: {s1, s2 in return s1 > s2}) rNames = names.sorted(by: {s1, s2 in s1 > s2}) rNames = names.sorted(by: {$0 > $1}) rNames = names.sorted(by: >) rNames = names.sorted(){$0 > $1} rNames = names.sorted{$0 > $1} print(rNames) let digitNames = [ 0: "Zero", 1: "One", 2: "Two", 3: "Three", 4: "Four", 5: "Five", 6: "Six", 7: "Seven", 8: "Eight", 9: "Nine" ] let numbers = [16, 58, 510] let strings = numbers.map { (number) -> String in var number = number var output = "" repeat { output = digitNames[number % 10]! + output number /= 10 } while number > 0 return output } print(strings) func makeIncrementer(forIncrement amount: Int) -> () -> Int { var runningTotal = 0 func incrementer() -> Int { runningTotal += amount return runningTotal } return incrementer } let incrementByTen = makeIncrementer(forIncrement: 10) print(incrementByTen()) print(incrementByTen()) print(incrementByTen()) print(incrementByTen())